com.facebook.presto.hive.HiveBucketProperty Maven / Gradle / Ivy

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.hive;

import com.facebook.presto.common.type.Type;
import com.facebook.presto.hive.metastore.SortingColumn;
import com.facebook.presto.spi.PrestoException;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;
import org.apache.hadoop.hive.metastore.api.StorageDescriptor;

import java.util.List;
import java.util.Objects;
import java.util.Optional;

import static com.facebook.presto.hive.BucketFunctionType.HIVE_COMPATIBLE;
import static com.facebook.presto.hive.BucketFunctionType.PRESTO_NATIVE;
import static com.facebook.presto.hive.HiveErrorCode.HIVE_INVALID_METADATA;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.util.Objects.requireNonNull;

public class HiveBucketProperty
{
    private final List bucketedBy;
    private final int bucketCount;
    private final List sortedBy;
    private final BucketFunctionType bucketFunctionType;
    private final Optional> types;

    @JsonCreator
    public HiveBucketProperty(
            @JsonProperty("bucketedBy") List bucketedBy,
            @JsonProperty("bucketCount") int bucketCount,
            @JsonProperty("sortedBy") List sortedBy,
            @JsonProperty("bucketFunctionType") BucketFunctionType bucketFunctionType,
            @JsonProperty("types") Optional> types)
    {
        this.bucketedBy = ImmutableList.copyOf(requireNonNull(bucketedBy, "bucketedBy is null"));
        this.bucketCount = bucketCount;
        this.sortedBy = ImmutableList.copyOf(requireNonNull(sortedBy, "sortedBy is null"));
        this.bucketFunctionType = requireNonNull(bucketFunctionType, "bucketFunctionType is null");
        this.types = requireNonNull(types, "type is null");
        if (bucketFunctionType.equals(PRESTO_NATIVE)) {
            checkArgument(types.isPresent(), "Types must be present for bucket function type " + bucketFunctionType);
            checkArgument(types.get().size() == bucketedBy.size(), "The sizes of bucketedBy and types should match");
        }
        else {
            checkArgument(!types.isPresent(), "Types not needed for bucket function type " + bucketFunctionType);
        }
    }

    public static Optional fromStorageDescriptor(StorageDescriptor storageDescriptor, String tablePartitionName)
    {
        boolean bucketColsSet = storageDescriptor.isSetBucketCols() && !storageDescriptor.getBucketCols().isEmpty();
        boolean numBucketsSet = storageDescriptor.isSetNumBuckets() && storageDescriptor.getNumBuckets() > 0;
        if (!numBucketsSet) {
            // In Hive, a table is considered as not bucketed when its bucketCols is set but its numBucket is not set.
            return Optional.empty();
        }
        if (!bucketColsSet) {
            throw new PrestoException(HIVE_INVALID_METADATA, "Table/partition metadata has 'numBuckets' set, but 'bucketCols' is not set: " + tablePartitionName);
        }
        List sortedBy = ImmutableList.of();
        if (storageDescriptor.isSetSortCols()) {
            sortedBy = storageDescriptor.getSortCols().stream()
                    .map(order -> SortingColumn.fromMetastoreApiOrder(order, tablePartitionName))
                    .collect(toImmutableList());
        }
        return Optional.of(new HiveBucketProperty(
                storageDescriptor.getBucketCols(),
                storageDescriptor.getNumBuckets(),
                sortedBy,
                HIVE_COMPATIBLE,
                Optional.empty()));
    }

    @JsonProperty
    public List getBucketedBy()
    {
        return bucketedBy;
    }

    @JsonProperty
    public int getBucketCount()
    {
        return bucketCount;
    }

    @JsonProperty
    public List getSortedBy()
    {
        return sortedBy;
    }

    @JsonProperty
    public BucketFunctionType getBucketFunctionType()
    {
        return bucketFunctionType;
    }

    @JsonProperty
    public Optional> getTypes()
    {
        return types;
    }

    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        HiveBucketProperty that = (HiveBucketProperty) o;
        return bucketCount == that.bucketCount &&
                Objects.equals(bucketedBy, that.bucketedBy) &&
                Objects.equals(sortedBy, that.sortedBy) &&
                bucketFunctionType.equals(that.bucketFunctionType) &&
                Objects.equals(types, that.types);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(bucketedBy, bucketCount, sortedBy, bucketFunctionType, types);
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("bucketedBy", bucketedBy)
                .add("bucketCount", bucketCount)
                .add("sortedBy", sortedBy)
                .add("types", types)
                .add("bucketFunctionType", bucketFunctionType)
                .toString();
    }
}